Air-Sea CO2 fluxes
Description
Data wind speed 10m (m/s):
→ Azur buoy (model) - 2009-2022
→ EOL buoy (model) - 2009-2022
Frequency : Hourly
Unit : m/s
Histogram of wind speed distribution : pelagic (Azur buoy) vs coastal (EOL buoy)
Annual means of wind speed (2009-2022) : EOL buoy
Data pCO2 water Point B (µatm):
period : jan.2007 - dec.2022
Surface data,
Frequency : Weekly (every tuesday at 09 AM)
Unity : µatm
Annual cycle of seawater pCO2 at Point B (2007-2022) :
Calculation of NpCO2 & TpCO2 and deltas :
NpCO2 = non-temperature effects on pCO2 water variations
TpCO2 = only temperature effects on pCO2 water variations
→ Calculation of deltas :
delta pCO2(T) = temperature effects = pCO2 water - NpCO2
delta pCO2(bio) : biological effects = pCO2 water - TpCO2
Atmospheric and seawater pCO2 (µatm) according to time (2007-2022) :
Air-sea CO2 fluxes
Flux calculation
→ negative values = flux into the ocean
Method used : Wanninkhof (2014)
Method used : Wanninkhof (1992)
Formulas :
K600 = 0.266 * U²
SC = 2073.1 - (125.62 * T) + (3.6276 * T²) - (0.043219 * T^3)
k = K600 * (SC/600)^0.5 (cm/h)
K0 = Henry’s constant (seacarb)
Final formula : F = k * K0 * ΔpCO2
unity : mol of C / m² / year
Plot comparing the 2 CO2 fluxes :
Annual fluxes (Wanninkhof, 2014)
## [1] 0.1390504
Comparison with DE CARLO results (jan.2007 - oct.2011)
Point B : 2009-2011, so comparison for 2009-2011 period
## [1] -1.649429e-06
De Carlo (2007-2011) :
- average hourly flux : -2.19e-05
- annualized flux (by year) : -1.91e-01
- maximum hourly flux (winter) : -4.57e-04
- minimum hourly flux (summer): 4.29e-04
De Carlo (01/06/2009 - 10/04/2011) :
- average hourly flux : -2.77e-05
- annualized flux (per year) : 2.42e-01
- maximum hourly flux (winter) : -4.57e-04
- minimum hourly flux (summer): 4.29e-04
Point B (01/06/2009 - 10/04/2011) :
- average hourly flux : -1.65e-06
- annualized flux (by year) : 1.45e-02 - maximum hourly flux (winter) :
-3.23e-04
- minimum hourly flux (summer) : 5.70e-04